<template>
  <ul>
    <li :style="{ opacity }">欢迎学习vue</li>
    <li>news001 <input type="text" /></li>
    <li>news002 <input type="text" /></li>
    <li>news003 <input type="text" /></li>
  </ul>
</template>
  
  <script>
export default {
  name: 'News',
  data() {
    return {
      opacity: 1,
    };
  },
  /* beforeDestroy() {
    console.log('News组件即将被销毁了');
    clearInterval(this.timer)
  }, */
  /*   mounted() {
    // console.log('mounted', this);
    this.timer=setInterval(() => {
      this.opacity -= 0.01;
      if (this.opacity <= 0) this.opacity = 1;
    }, 16);
  }, */
  // 被激活的
  activated() {
    console.log('News组件被激活了');
    this.timer=setInterval(() => {
      this.opacity -= 0.01;
      if (this.opacity <= 0) this.opacity = 1;
    }, 16);
  },
  // 失活
  deactivated() {
    console.log('News组件失活了');
    clearInterval(this.timer)
  },
};
</script>